Plot hole: The snakes escape from the locked box stored in the cargo hold when a small explosive bolt detonates and opens the lid. Post 9/11 all luggage placed in the cargo hold of an airliner would be tested for explosives, and anything larger than half a match head would be detected. The chances of getting an explosive bolt on board - nil. None whatever. You can also think of it this way - if the bad guys could somehow smuggle explosives on board, why bother with such an elaborate and flawed plan as letting snakes loose on the plane? Why not just smuggle a bomb on board? Pan Am 103 - the so-called Lockerbie flight - was brought down with a bomb that fit inside a small cassette player.
Plot hole: There are six metal bars mounted around the circumference of the water wheel's axle. In the wheel's interior, when Jack frees himself he lands on his feet, begins to run and promptly hits his head on one of those mounted axle bars, then falls out. Moments later, when Jack returns and runs in the wheel, he is shorter (way more than a foot) than all six of the mounted axle bars spinning with the water wheel, which would make that previous shot impossible, however humorous it is. (01:52:40 - 01:53:55)
Plot hole: Christopher Columbus speaks Italian while the Huns supposedly speak their native language. Shouldn't Octavius and his Romans speak Latin? (00:34:50)
Plot hole: When the ship has turned on its side for the brief moment, it cuts to inside the ship where a hallway explodes, causing the ship to submerge. The only problem is the people are standing on the ceiling, but if the ship's on its side, they'd be on the wall, not ceiling.
Plot hole: Where did Cross get the blood on his hands? The gloves were clean of blood after he looked at the teeth and removed the gloves, so where did it come from?
Plot hole: When Magneto lands the bridge between San Francisco and Alcatraz, only the ends of the bridge are on land, with the rest still suspended in the air despite having nothing to keep it there. Magneto could arguably be using his powers to keep it supported, but at the moment he loses his powers it still does not collapse at the center.
Plot hole: If the gasoline in fuel lines and tanks is reaching flash point and exploding, there should not be so many cars just sitting around. Surely all of those vehicles' tanks are not dry.
Plot hole: When we see the Zenith Team playing softball, it's a scene taken from later in the movie. For one thing, Mr. Pibb is there, even though we don't meet him until the next scene. Second, they're in the room with the UFO, but we don't see that until later. Finally, Zoom's outfit is different than the last scene, but in the next scene he's wearing the same outfit.
Plot hole: Alex and Jack go to Liverpool St. Station to find the guys from Jeff Slater's. This is on the day of the funeral, otherwise it would make no sense going there. But when Mrs Jones sees Alex, she says "shouldn't you be at school?" This makes no sense because Alex would not go to school on the day of the funeral. It's not a character mistake because Mrs. Jones would never make that mistake.
Plot hole: When Oleg calls Teresa from the pedophile's playroom, he tells her the address of their house: 1456 Owens Park Lane, Hoboken. When Teresa shows up, she tells the pedophile that he called from this apartment, 1456 Owens Park Lane, Apartment 303. Oleg never told her what apartment number he was in.
Plot hole: When 02 is carjacked, he runs after his vehicle for some distance. When he finally gives up, he looks into a nearby alley and sees Coco, the girl who initially marked him for the carjacking. This conveniently moves the story along, but makes no sense. She could not have run that distance so quickly, nor would she have reason to follow him.
Plot hole: Right at the end when Pete calls for the "Hard Car" to evacuate the president, he gives very specific orders as to the evacuation point. Considering he was to be arrested on sight, there is no way he would know any of the security arrangements and they would surely have changed them radically because he was such a senior agent. The Secret Service is constantly changing their security.
Plot hole: Just before the bomb explodes at the beginning of the movie, the guard is looking for the car playing 'don't worry baby' on it's stereo. In the final timeline the disaster has been averted, the bomb having gone off, and the ferry docked. After this, when Carlin is in the car, the same song is playing, but the bomb was set to a timer.
Suggested correction: That's why the movie is called Deja Vu and thats why Carlin gives the girl such a strange look. The song triggers a feeling of Deja Vu for him and it almost feels to him that he knows her. Besides, a different station could have been playing the song.
Suggested correction: The first time it plays comes off the radio. The second time we hear it mid-play. It could have come from a different station, the same station could have played it again later, or a CD or cassette being played in the car.
Plot hole: Why would the club/casino accountant let Jack take the money without reacting, and then - just as he got away, go berserk with a machine-gun - and keep shooting even though he was gone?
Suggested correction: They wanted to make it look like an accident. If the snakes had done their job fully, plane crashes and no-one is the wiser. If the plane blew up halfway it would have screamed foul play. As it was in the movie it was just a terrible accident, a bunch of snakes being shipped got loose.
That doesn't correct the posting. The error is that they could not have smuggled a package equipped with an explosive bolt onto the airliner in the first place. It would have been detected and the package removed from the airliner and either defused or safely detonated. As for nobody being the wiser after the plane crashes, what were all those dead snakes doing scattered about the wreckage?